Just a friendly note:
Don't ask what is best (check out the
fourm rules)
To use nnedi3 to upscale you use nnedi3_rpow2().
The first example from the help file for nnedi3:
Quote:
enlarge image by 4x, don't correct for center shift.
nnedi3_rpow2(rfactor=4)
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I prefer a less ringing resize compaired to lanczos4, lanczos4 also requires more bits to encode. I like spline36 for most of my down scale resizes. Doing a large upscale I would use nnedi3 followed by spline36 to downscale again to the desired resolution, if I had the time.
I like this set of
kernel visualizations from PhrostByte's ResampleHQ's documentation to understand the tradeoffs between resizers.